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Figure 6a.  Two tendinous components of the supraspinatus tendon. (a) Oblique sagittal proton-density–weighted MR image shows the anterior "cylindric" (solid straight arrows) and posterior "flat" (curved arrows) contributions of the supraspinatus tendon. The fibers of the infraspinatus tendon (open arrows) interdigitate with the supraspinatus tendon. (b) Corresponding US image shows the cylindric (straight arrows) and flat (curved arrows) contributions of the supraspinatus tendon.